Portable grinding machine



Dec. 3, 1935. J. P. MCNEIL PORTABLE GRINDING MACHINE Filed May 2, 1955 5Sheets-Sheecl l Dec., s, 1935. J PQ MCNEIL 2,023,335

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v 23,335 D 3 1935. J. P. MONEIL 2,0

ec. PORTABLE GRINDING MACHINE l d May 2 1935 3 Sheets-Sheet 3 Fi e JahnP MflVezZ wmf@ @htm/Aq Patented Dec. 3, 1935 UNITED STAT-Es PATENTOFFICE 7 Claims.

This invention relates to a portable grinding machine capable ofassuming a very compact form'when not in use and adapted to be carriedin a manner similar to a suitcase or the like.

It is particularly aimed to provide such a construction which will berelatively light in weight and will furnish all of the necessaryequipment for the prompt grinding or sharpening of knives, scissors orother implements or tools.

The more specific objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawings:-

Figure 1 is a perspective view of the device in its portable condition;

Figure 2 is a cross sectional view taken on the line 2 2 of Figure 1;

Figure 3 is a plan view of the device;

Figure 4 is a side elevation of the device;

Figure 5 is a vertical sectional view taken on the plane of line 5-5 ofFigure 3;

Figure 6 is a vertical sectional view taken on the plane of line 6 6 ofFigure 3;

Figure 'l is a View substantially similar to Figure 6, with thegrindstone support retracted;

Figure 8 is a detail section illustrating the mounting of the uppercrank driven by the treadle;

Figure 9 is a cross sectional View taken on the line 9-9 of Figure 5;

Figure 10 is a detail section taken on lthe line I0-I0 of Figure 5; and

Figure 11 is a vertical sectional view through a modied form of theinvention.

Referring specically to the drawings, wherein like reference charactersdesignate like or similar parts, I0 designates a casing, housing or thelike of any suitable size, shape and materiaLfor instance, of wood ormetal. One side wall II, of said housing, is hinged to the housing as atI2 so that it may be opened or closed to give access to the parts whendesired.

In addition, hasps I3 are pivoted to the inner side of the wall orclosure I Iv and are engageable with staples I4, carried by the adjacentwalls of the housing. Any suitable means, if desired, maybe used tosecure the hasps I3 to the staples against accidental detachment. Suchwall or closure II has a bar I5 attached thereto, in turn having ahandle I6, secured adjustably thereto by means of bolts I1, passingthrough elongated slots I8 in the bar and handle, the bolts having wingnuts I9. The adjustable mounting of the naled in the mounting 28a.

handle I6 enables it to be fastened in different positions for balancingaccordingto the load or distribution thereof within the casing IIJ.

One end wall 2D is removable, having a continuous flange 2I whereby suchwall is telescoped 5 over one end of the casing, including the closureII, whereby the latter cannot accidentally open. Staples 22 are providedadjacent the closure 20 on the side wall of the casing, and they areengaged by hooks 23 pivoted at 24 to hasps 25, pivl0 oted at 26 to saidclosure 20.

The purpose of having the closure 20 removable is to enable a supportingtable 21 for the grinding tool to be projected from the normallyretracted position shown in Figure 7 to the posi- 15 tion shown inFigure 6. Such table has a pair `of U-shaped brackets 28 fastenedthereto, whose legs 29 have elongated slots 30a therethrough. Cleats 3Iaare fastened to the casing I0 behind the legs 29 and they mount bolts32av which pass 20 through the slots 30a and beyond the same receivewinged nuts 33 by means of which the table may be rigidly fastenedeither in the retracted position of Figure '1 or the projected positionof -Figure 6. 25

Said table 21 is suitably cut away, to enable a bracket or mounting 28ato engage the same and be removably clamped thereto through the mediumof a screw 29a carried by the bracket or mounting. A shaft 30 isjournaled in the mount- 30 ing 28a and it removably carries a tool 3lshown as a grinding tool and for instance such as an emery wheel orordinary grindstone. Obviously, `the invention may be used in connectionwith 'other tools and hence the showing at 3| is to be 35 taken as broadsince the shaft 30 may be used to operate a disk saw, a drill, or othertool. Keyed to the shaft 30 is a gear wheel 32 enmeshed with a gearwheel 33 carried by a shaft 34 also jour- Shaft 34 projects be- 40 yondone side of the mounting 28a and has a pulley 35 fastened thereto. Oversaid rpulley 35 a belt 36 is trained, which passes through the table 21in View of its slotting at 31, and traverses a pulley 39 within thecasing. A guard or protecting housing 40 is disposed over the pulley 35and adjacent parts, being fastened as at 4I to the mounting 28a. Saidpulleys 35 and 39 are preferably grooved to better retain the belt.

Said pulley 39 is keyed to a cross shaft 42 50 journaled at oppositeends by bearing means 43 and 44. Said shaft 42 has a crank 45 with whicha pitman 45 is pivoted and Which in turn is pivoted at its lower end at41 with a treadle 48, rigid on a rock shaft 49, also journaled bysuitable 55,

bearing devices 50 and 5I, identical with those at 43 and 44,respectively. Since it usually is necessary for a mechanic to beskillful to operate the device through one treadle 48, I provide asecond treadle at 52. Such treadle 52 is pivoted at 53 to the rock shaft49 in a manner to limit unfolding of the treadle 52 into alinement withthe treadle 48. Thus a treadle is provided for operation by each foot.Ordinarily, the casing is not of a size to permit the use or presence oftwo treadles Within the same. Said treadle 52 is normally folded flatagainst the outside of the casing as in Figures l, 2, and 5, being heldby a releasable spring finger 54.

Reverting to the bearing devices generally designated 43 and 50, theyare preferably of the form shown in Figure 9. The shafts 42 and 49, areconnected to ball-bearing cages Within such devices and the devicesconsist of plates 55 rigidly fastened to the Wall of the casing andplates 56, which are the upper ones, detachably bolted as at 51 to saidplates 55. Said plates are bulged as at 58 and 59 respectively, in orderto enclose the ball bearing races.

As I have found that bolts or the like interfere with movement of thefoot on the treadle 48, I preferably use the form of bearing deviceshown in Figure 10, at 44 and 5|. This device comprises a section orplate 60 suitably fastened to the wall of the casing I0, and slidablyreceiving a plate 6l. Plate 6I is insertable from above and is guidedand retained by iianges 62 integral on the plate 60. Such plates 60 and6l have bulged portions 63 and 64, which retain the ball bearing racesconnected to the respective shafts 42 and 49.

It will be seen that the device may be transported from place to placein the manner of a suit-case in view of its provision with a handle I6and the compact construction and arrangement of the parts. When usingthe device, it is stood on one end, treadle 52 lowered, and closure 20removed, table 2`| projected, and the mounting 28a and the associatedparts positioned operatively as in Figures 3, 4, 5, and 6, for example.Thereupon the treadles may be operated to impart motion through thegearing shown to the tool 3 l It is clear that various changes may beresorted to within the spirit and scope of the invention. For instance,I do not limit myself to any particular gearing for operating theY shaft30 and tool from the treadle, hence for example, chain and sprocketmeans may be substituted for the parts 35, 36 and 39Y or various typesof gearing may be used.

For instance, I may employ the form of Figure 11 wherein bevel gears areused in lieu of the chain and sprocket. Also shaft 42 which correspondsto shaft 42 and shaft 34' which corresponds to shaft 34 may respectivelybe provided with beveled gear wheels 10 and 1|. A shaft 'l2 is journaledin brackets 13 and 14 fastened to the housing, and it has beveled gearwheels and 16 enmeshed with the gear Wheels 'ID and 34', respectively.

Said shaft 12 is in telescopic section so that the upper section may beremoved with the grinding or` tool assembly to permit the table to bepositioned within the casing and the end wall applied thereover.

It will be understood that the grinding or other tool and mounting whendetached, together with other tools or accessories desired by the owner,may be carried within the casing I0.

I claim as my invention:

l. A device of the class described having a casing, a removable end wallon said casing, a side wall of said casing being movable to openposition, and said end Wall having a flange overlapping said side wallto normally prevent opening thereof, a table, and means mounting saidtable normally Within the casing and for projection through the open`end of the casing when said end wall is removed. l0

2. A device of the class described having a casing, a removable end'wall on said casing, a side wall of said casing being movable to openposition, said end wall having a flange overlapping said side wall tonormally prevent opening 15 thereof, a table, means mounting said tablenormally within the casing and for projection through the open end ofthe casing when said end wall is removed, said table having dependinglegs, and bolt means carried by the casing coacting with said legs tosecure them in the different positions.

3. A device of the class described having a casing, a removable end wallon said casing, a side wall of said casing being movable to openposition, said end wall having a flange overlapping said side wall tonormaly prevent opening thereof, a table, means mounting said tablenormally within the casing and for projection through the open end ofthe casing when said end wall is removed, a tool device removablyapplicable to the table in its projected position, and gearing for saidtool device operative from within the casing.

4. A device of the class described having a casing, a removable end wallon said casing, a side wall of said casing being movable to openposition, said end wall having a flange overlapping said side wall tonormally prevent opening thereof, a table, means mounting said ltablenormally within the casing and for projection through the open end ofthe casing when said end wall is removed, a tool device removablyapplicable to the table in its projected position, and gearing for saidtool device operative from Within the casing comprising cross shafts, apit- 4'5 man connected to one of said shafts, a treadle pivoted to theother shaft and to said pitman, and driving means from one of saidshafts to said tool device.

5. A device of the class described having a casing, a removable end wallon said casing,

a side wall of said casing being movable to open position, said end wallhaving a flange overlapping said side wall to normally prevent openingthereof, a table, means mounting said table normally within the casingand for projection through the open end of the casing when said end wallis removed, a tool device removably applicable to the table in itsprojected position, and gearing for said tool device operative fromwithin the casing comprising cross shafts, a pitman connected to one ofsaid shafts, a treadle pivoted to the other shaft and to said pitman,and driving means from one of said shafts to said tool device, said tooldevice comprising a 65 mounting detachably connected to said table.

6. A device of the class described having a casing, a removable end wallon said casing, a side wall of said casing being movable to openposition, said end wall having a flange overlapping said side Wall tonormally prevent opening thereof, a table, means mounting said tablenormally Within the casing and for projection through the open end ofthe casing when said end wall is removed, a tool device removablyapplicable to the table in its projected position, gearing for said tooldevice operative from Within the casing comprising cross shafts, apitman connected to one of said shafts, a treadle pivoted to the othershaft and to said pitman, and vdriving means from one of said shafts tosaid tool device, said tool device comprising a mounting detachablyconnected to said table, a treadle pivoted to the last mentioned shaftexteriorly of the casing, said last mentioned treadle being ioldableagainst the casing, and means on the casing to hold said treadle in itsfolded position.

'7. A device of the class described having a casing, means to mount atool thereon, driving means for said tool including a rock shaft, atreadle fastened to the rock shaft, a treadle pivoted to the rock shaftexteriorly of the casing and foldable against the casing, and means toreleasably secure the second mentioned treadle against the casing.

JOHN P. MCNEIL.

